Analysis of Magnetic Helicity Injection by RF Waves

射频波磁螺旋注入分析

• 批准号: 01580011
• 负责人: FUKUYAMA Atsushi
• 金额: $ 1.02万
• 依托单位: Okayama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01580011/
• 关键词: Nuclear Fusion; Plasma; Tokamak; Current Drive; magnetic Helicity; Electromagnetic wave

The mechanism of magnetic helicity injection and current drive by RF waves was studied both analytically and numerically.1. Current drive via non-resonant interaction between RF waves and plasma studied in a stationary state. The non-resonant interaction generates a non-conservative force, in addition to the usual conservative ponderomotive force. The force of our concern mainly acts as an internal force among plasma species ; the net momentum input from the wave to the plasma is small in this process. The current drive by this process is different from the conventional RF current drive schemes based on resonant wave-particle interactions, and is associated with the change of RF wave helicity.2. A one-dimensional wave code was extended to calculate the driven current associated with the nonresonant force. The analysis is applied to ICRF waves in a large tokamak. The profiles of driven current and helicity absorption were obtained. It was confirmed that the local current drive efficiency is independent of the plasma density and strongly depends on the temperature. The global current drive efficiency, however, depends on central density owing to the change of propagation and absorption structure.3. Current drive by the helicity injection via a plasma surface requires spatial diffusion of the current. In order to study the mechanism of the current diffusion in a tokamak, we have developed a three-dimensional bounce-averaged Fokker-Planck code. This code was used to simulate the electron cyclotron current drive experiment. The broadening of the current profile and the reduction of the current drive efficiency have been observed by including spatial diffusion of fast electrons.

从理论和数值两方面研究了射频波对磁螺旋度注入和电流驱动的机理.在稳态下研究了通过射频波与等离子体之间的非共振相互作用的电流驱动。除了通常的保守有质动力之外，非共振相互作用产生非保守力。我们所关心的力主要作为等离子体物种之间的内力;在这个过程中，从波到等离子体的净动量输入很小。该过程的电流驱动不同于传统的基于共振波粒相互作用的射频电流驱动方案，而是与射频波螺旋度的变化有关.一维波的代码进行了扩展，以计算与非共振力的驱动电流。本文的分析应用于大型托卡马克中的ICRF波。得到了驱动电流和螺旋度吸收的分布。结果表明，局部电流驱动效率与等离子体密度无关，而与温度密切相关。由于传输和吸收结构的变化，整体电流驱动效率取决于中心密度.经由等离子体表面的螺旋度注入的电流驱动需要电流的空间扩散。为了研究托卡马克中的电流扩散机制，我们发展了一个三维反弹平均的Fokker-Planck程序。该程序用于模拟电子回旋加速器电流驱动实验。通过包括快电子的空间扩散，已经观察到电流分布的加宽和电流驱动效率的降低。

项目成果

A. Fukuyama: "Dynamic Response of Stationary Burning Plasma" Proc. of 13th Int. Conf. on Plasma Physics and Controlled Nuclear Fusion Research. IAEA-CN-53/G-2-7.

A. Fukuyama：“静止燃烧等离子体的动态响应”Proc。

A.Fukuyama: "NonーResonant Current Drive and Helicity Injection by RF Waves"

A.Fukuyama：“射频波的非谐振电流驱动和螺旋度注入”

A.Fukuyama: "Nonresonant Current Drive by RF Helicity Injection" Proc.of 13th Int.Conf.on Plasma Physics and Controlled Nuclear Fusion Research. IAEAーCNー53/Iー2ー4. (1990)

A.Fukuyama：“射频螺旋注入的非谐振电流驱动”第 13 届国际等离子体物理和受控核聚变研究会议论文集（IAEA-CN-53/I-2-4）。

A. Fukuyama: "Three-Dimensional Fokker-Planck Analysis of Electron Cyclotron Current Drive in a Tokamak"

A. Fukuyama：“托卡马克中电子回旋电流驱动的三维福克普朗克分析”

K.Hamamatsu: "Rf Heliclty Injection and Current Drive" Physics of Fluids.

K.Hamamatsu：“射频螺旋注入和电流驱动”流体物理学。